I've always used regular bind off for the armholes. You're going to seam there, anyway, so it never sees the light of day.
However, for shoulders, even if they say to bind off, I leave my stitches live and do a three-needle bind off. The difference in the finished look is amazing. If the shoulders are supposed to be sloped, I have to make the choice of leaving them flat or doing short row shaping in anticipation of three-needle bind off. I LOVE three-needle bind off for shoulders!!!!!!